Chevrolet DB90 Series, Service Manual

Page: 61 / 242

S ec. 6A-55
GASOLINE ENGINES
Figure 3 —C rankshaft Pulley Rem oval ITypicalI
2. U se im pact w rench or block the crankshaft
to prevent turning and u se suitable socket wrench
and handle to loosen bolt which se c u r e s pulley hub
to crankshaft.
3. Rem ove bolt and thick w asher, then a s s e m ­
b le sp ec ia l p u ller and center plug in manner shown
in figure 3. Turn p u ller screw to rem ove pulley
hub or damper from crankshaft. A tapered cone
(fig. 4) is used in addition to retain er w asher on
engines having a crankshaft damper a ssem b ly , or
T ilt cab m odels with crankshaft pulley hub.
4. R em ove key from keyway in crankshaft.
INSTALLING PULLEY HUB
OR DAMPER ASSEMBLY
1. Clean s e a l area on crankshaft pulley hub
or damper hub thoroughly and apply engine o il on
su rfa ce contacted by o il se a l.
2. On 637 engine check position of O -rin g sea l
(1, fig. 5) which should be located approxim ately
M” from slin g e r (2, fig. 5) so it w ill r o ll into coun­
terb o re in hub a s damper is in stalled .
IMPORTANT: On 637 engines, lu b ricate O-
ring with engine o il.
3. Align keyway in pulley with key in crank­
shaft, then sta rt pulley or hub onto front end of
crankshaft. A ssem b le sp ecia l in sta lle r typically
shown in figure 5, and turn nut with w rench to
fo rce pulley firm ly into p lace on crankshaft.
4. Rem ove in sta lle r , then referrin g to figure
4, locate cone (if used) at hub, and in sta ll retain ­
ing w asher and bolt. Tighten retaining bolt to
"Specifications" at end of th is sectio n .
5. Mount crankshaft pulley on pulley hub or
dam per.
ENGINE OIL PAN REPLACEMENT
(V8 ENGINE)
(Key Numbers in T ext R efer to F igure
6
)
OIL PAN REMOVAL
1. Clean a ll dirt and accum ulated m aterial
from o il pan attaching bolts and drain plug.
2. Drain o il from o il pan.
3. R em ove low er oil pan b olts (14), then r e ­
m ove low er pan (
1
) and gasket (
1 2
).
4. L oosen upper and low er o il in let tube nuts
(7) s e e in set in figure
6
.
5. R em ove two b o lts, nuts, and w ash ers (5)
attaching o il pump suction sc reen bracket (
8
) to
upper pan (
2
).
6
. R em ove low er o il inlet tube nut (7), r e ­
move float a ssem b ly (9) and suction sc r e e n bracket
(
8
).
1 Seal "O" Ring
2 Slinger
3 Key
4 Installer
5 Installer Screw
6
Thrust Bearing
7 Crankshaft Damper
8
Crankshaft
9 Engine Front Cover
10 Oil Seal
12,72
Figure 4 —C rankshaft D am per Retaining Parts (Typical)
Figure 5 —In stallin g D am per
on
C rankshaft
w ith Special Tool Set
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT